uxcell M6 Thread Dia Dome Head Nylon Cap Acorn Hex Nuts Black 20pcs Thread Size: M6/0.24"(Female.Diameter); Product Name: Cap Nuts Material: Nylon(4.8 Grade); Weight: 10g Package Content: 20pcs x Cap Nuts; Main Color: Black Dome Head Size: 10x4mm/0.4"x0.16"(Max.D*Height); Total Height: 11mm/0.43" Hex Width: 10mm/0.4"; Fastener Type: Cap Acorn Nut